Unable to access Keychain on macOS Sequoia 15.5
On Sequoia 15.5 when I try to start Keychain Access either by double clicking a certificate or by double clicking on '/System/Library/CoreServices/Applications/Keychain Access.app' or doing "open '/System/Library/CoreServices/Applications/Keychain Access.app'" in a terminal, it shows a dialog offering to start the Passwords app instead. I select the 'Open Keychain access' option and it asks for my login password twice but doesn't appear and there is no icon for it in the dock.
This appears to the issue reported here, without resolution:
Keychain Access Not Working - Apple Community
Is there a workaround for this?
[Re-Titled by Moderator]
Original Title: Keychain Access doesn't start